Device and process for producing reinforcing layers on cylinder running surfaces of internal combustion engines and the like

ABSTRACT

The cylinder running surfaces of an internal combustion engine are treated with pretreatment and coating baths by using flush-in devices (5, 11) with lances insertable into the cylinder bores (1&#39;). The flush-in devices (5, 11) can be successively connected via manifold devices (10, 12) with reservoirs (V 1  to V 5  ; B 1  to B 3 ) for different bath liquors. Thus, each flush-in device (5, 11) serves for the successive introduction of different bath liquors into the cylinder bores (1&#39;).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a device as well as to a process for producingreinforcing layers in particular on cylinder running surfaces of thecylinder bores especially of light metal cylinder blocks and the like inconnection with internal combustion engines and the like, bysuccessively introducing treatment and coating baths into the cylinderbores.

2. The Prior Art

Such devices or methods are basically known and used primarily in themanufacture of such internal combustion engines having a cylinder blockconsisting of light metal, in particular of aluminum or an aluminumalloy.

In this connection, a nickel dispersion layer is produced, as a rule,for increasing the resistance to wear of the cylinder running surfaces.

For producing such dispersion layers, immersion processes are known inwhich the entire cylinder block is successively placed in differentbaths by means of suitable manipulators.

Said process is disadvantageous to the extent that when the cylinderblock is transferred from one bath into the other, relatively much bathliquor is carried along from the preceding bath. In addition,unnecessarily large surfaces of the workpiece come into contact with thebath liquors.

It is known from DE-OS 39 37 763 to treat only the cylinder runningsurfaces with the baths by introducing the respective bath liquors intothe cylinder bores. For this purpose, the cylinder block is arranged ona sealing plate, which serves as the workpiece carrier, and which istransferred together with the cylinder block between the varioustreatment positions at the various baths. The sealing plate, which isarranged on the cylinder head side of the cylinder block pointingdownwardly during the bath treatment, has openings that are coaxial withthe cylinder bores, so that the sealing plate can be lowered togetherwith the cylinder block in the treatment positions onto verticalspraying or flushing tubes, by means of which the respective bath liquoris then flushed into the cylinder bores.

It is made possible in this way that the bath liquors are only admittedto the surfaces of the workpiece that are to be reinforced.

However, all the methods specified above have the drawback that thecycle times for transferring the cylinder block between the individualbaths can not be synchronized in a desirable way with the respectivebath treatment times. While some bath liquors have to or may act on thecylinder running surfaces only for a short time, other bath liquors haveto act for clearly longer time periods. This leads to the fact that thelongest treatment time determines the cycle times for transferring thecylinder block from one bath to the next. It has to be accepted in thisconnection that the cylinder block clearly dwells longer in some bathsthan would be necessary for the treatment with the respective bathliquor. This, however, is basically undesirable because it means onenecessarily has to put up with the fact that individual bathinstallations are clearly used below their capacity.

A further problem of the processes known heretofore is that particularlywith engines with a V-shaped cylinder arrangement. The two cylinderrows, because of the upwardly open process space, have to be verticallyaligned one after the other for the coating process, which highlyincreases the time expenditure.

Additional drawbacks of the upwardly open process space are an increasedrisk of contamination and the limited possibilities for influencing theflow conditions in an open process space.

SUMMARY OF THE INVENTION

Therefore, an object of the invention is to create a novel device, whichpermits the bath-technological manufacture of reinforcing layers atcomparatively low expenditure and avoids the drawbacks of an upwardlyopen process space.

According to the invention, the object is achieved wherein the bathliquors are admitted into the cylinder bores by means of flush-indevices. These devices by way of a manifold arrangement, are connectablewith a plurality of basins of reservoirs for the treatment or coatingbaths to be admitted into the cylinder bores one after the other. Thus,the flush-in devices have lances, which are insertable into the cylinderbores from one side. These bores are fitted with closing pieces, bymeans of which the cylinder bores can be sealed liquid-tight at theirtwo face ends.

Thus the invention is based on the general idea of using one singleflush-in device for the successively occurring admission of differenttreatment or coating baths into the cylinder bores. Also there issealing the process space by closing pieces, whereby the sealing of thecylinder bores on both sides is carried out by means of lances. Theselances can be pushed into the bores on one side, with closing piecesmounted on said lances.

In this way, it is possible in an advantageous manner to admit the bathliquors into the cylinder bores even if the bores are aligned slantedrelative to the vertical in the respective treatment stations.Accordingly, cylinder bores of engines with a V-cylinder arrangement canbe easily coated as well without having to align the cylinder rowsvertically one after the other.

Special advantages of the invention are that the system according to theinvention is capable of operating economically also with relativelysmall series. The pressure in the process space can be varied. Thecylinder bores do not have to be accessible on both sides in order todelimit the process space by the closing pieces.

As a rule, it is useful to make provision for two flush-in devices. Thefirst flush-in device serves for the pretreatment of the runningsurfaces of the cylinder bores with different pretreatment baths. Theactual treatment baths are admitted into the cylinder bores by means ofthe second flush-in device. It is made possible in this way that allparts of the flush-in devices coming into contact with the bath liquorscan be manufactured from comparatively inexpensive materials , becausesince a flow of electric current has to be generated between parts ofthe flush-in devices and the walls of the cylinder bores as the coatingbaths are being admitted, the lances or parts of the latter have to bemade of electrically conductive materials which, as a rule, arechemically not resistant to the pretreatment baths.

When two flush-in devices are arranged, it is possible to manufacturethe parts coming into contact with the pretreatment baths fromelectrically nonconductive plastic material.

The parts of the flush-in devices, for example lances or the like, whichare electrically connected as anodes in the application of the coatingbaths, may then consist of lead or lead alloys.

However, it is basically possible also to manufacture the parts cominginto contact with the bath liquors, such parts being electricallyconnected as anodes, from materials that are resistant to all bathliquors, for example from platinized materials such as particularlytitanium. In this case, one single flush-in device suffices, by way ofwhich all pretreatment and coating baths can then be admitted into thecylinder bores.

So that the required overall treatment times can be largely adapted toeach other especially when using two flush-in devices, it is useful tocarry out the pretreatment of the cylinder running surfaces in thefollowing way:

First, a degreasing bath is admitted into the cylinder bores;subsequently, the cylinder running surfaces are pickled with an acidmixture; and the cylinder running surfaces are thereafter subjected to azincate treatment. The total time of said process steps approximatelycorresponds with the total time required for the application of thefollowing coating baths if the acid mixture used for pickling containsacids or salts dissociated in hydrogen ions, sulfate ions and fluorideions, as well as peroxides or peroxide-containing compounds,particularly about

    ______________________________________                                        100 to 200 g/L        H.sub.2 SO.sub.4                                        10 to 30 g/L          H.sub.2 O.sub.2, and                                    5 to 10 g/L           HF.                                                     ______________________________________                                    

With respect to preferred features of the invention, reference is madein all other respects to the claims and to the advantageous embodimentsexplained in the following, which are described by reference to thedrawing.

Especially in connection with cylinder blocks made of aluminum castalloys, it has been found that the aforementioned pickling treatmentactivates the cylinder running surfaces in a surprisingly good way, andthat a highly fine-crystalline zinc layer is thus developed in thesubsequent one-time only zincate treatment. The adhesion of a coating(reinforcing layer) produced after the zincate treatment is so high thata two-times zincate treatment as commonly applied according to the stateof the art can be dispensed with.

Incidentally, is is advantageous in connection with the aforementionedpickling treatment that the latter can be carried out at roomtemperature. Accordingly, heating energy can be saved. In addition, theevaporation rate is low, so that the exhaust air of the treatment roomsis loaded only slightly even if the baths are operated without bathexhaustion.

As compared to conventional pickling, only a relatively low picklingerosion occurs in the pickling treatment according to the invention,i.e., particularly low tolerances are made possible in connection withthe dimensional accuracy of the cylinder bores.

The pickling times are preferably between 20 seconds and 3 minutes,particularly preferred are times betweeen 30 and 60 seconds.

The subsequent depositing of the nickel dispersion layer is preferablyaccomplished by producing on the cylinder running surfaces a laminarflow of the coating bath, such flow penetrating an annular gap formedbetween the cylinder running surfaces and an anode of the flush-indevice.

By a step-by-step intensification of an electric galvanizing currentmaintained between the anode and the respective cylinder runningsurface, across a time span of 0.5 to 1 minute, it is possible at thebeginning of the coating to build up a mechanically low-tension baselayer, which subsequently permits a higher coating rate according to theincreased electrical current intensity. In this connection, it has beenfound that the following parameters are advantageous:

    ______________________________________                                        Nickel coating bath-Composition                                               NiSO.sub.4.7H.sub.2 O  500 to 700 g/L                                         H.sub.3 BO.sub.3       40 to 60 g/L                                           Tension reducer        0.1 to 2 g/L                                           SiC with 2.5 μm graining                                                                          40 to 80 g/L                                           Operating conditions                                                          Temperature            65° to 90° C.                            pH                     1.6 to 2.8                                             Flow                   laminar                                                Starting current density                                                                             5 to 20 A/dm.sup.2                                     ______________________________________                                    

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawing,

FIG. 1 shows a schematized representation of a complete plant with twoflush-in devices;

FIG. 2 shows an axial section through a manifold, by which the flush-indevices can be connected one after the other with different reservoirsfor different bath liquors;

FIG. 3 shows a horizontal section according to the section planeIII--III in FIG. 2;

FIG. 4 shows a schematic representation of a coating station forV-cylinder blocks;

FIG. 5 shows an axial section through a lance designed as an anode foradmitting a coating bath into a cylinder bore;

FIG. 5E shows an enlarged view of a portion of the tubular anode;

FIG. 6 shows an axial section through a manifold ring for flushing abath liquor into a cylinder bore;

FIG. 7 shows a face view of the manifold ring according to arrow VII inFIG. 6; and

FIG. 8 shows a schematized axial section through a closing piece for theliquid-tight closure of a face end of a cylinder bore.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

According to FIG. 1, a V-cylinder block is transported on a workpiececarrier 2 from preceding treatment stations to a pretreatment station 3,and subsequently to a coating station 4, from where the V-cylinder block1 is then passed on to further production stations.

A first flush-in device 5 is associated with the pretreatment station 3,said device serving the purpose of successively flushing differentpretreatment baths into the cylinder bores 1' of the V-cylinder block 1in order to prepare the cylinder running surfaces for the coatingcarried out later in the coating station 4.

For said purpose, the flush-in device 5 has the lances 6, which can beinserted in the cylinder bores 1', and which are provided with theclosing pieces or closing elements 7', 7", by means of which thecylinder bores 1' can be sealed liquid-tight at their two face ends.

Furthermore, the lances 6 are fitted with the feed and drain conduits 8and 9, respectively, by way of which different treatment liquors can beadmitted into the cylinder bores 1' and drained from the latter,respectively.

Now, an important special feature of the invention is that the feed anddrain conduits 8 and 9 of the lances 6 can be successively connected bymeans of a first manifold device 10 with the different reservoirs V₁ toV₅ for different pretreatment liquors. If, for example, the feed anddrain conduits 8 and 9 are connected via the manifold device 10 with thereservoir V₁, a pump associated with said reservoir V₁ conveys treatmentliquor from the reservoir V₁ to the feed conduit 8, so that therespective treatment liquor is admitted into one of the cylinder bores1' via one of the lances 6. Since the drain conduit 9 is, with themanifold device 10 in said position, connected with a return lineleading to the reservoir V₁, bath liquor continuously admitted into thecylinder bore 1' is simultaneously returned to the reservoir V₁.

Following switching of the manifold arrangement 10, treatment liquor canbe subsequently admitted into the cylinder bores 1' from the reservoirV₂ in basically the same way.

As soon as all of the cylinder bores 1' have been treated in thepretreatment station 3 with the bath liquors of the reservoirs V₁ to V₅associated with said station 3, the V-cylinder block 1 is transferred tothe coating station 4.

Another flush-in device 11 is associated with said coating station 4,which device basically operates in the same way as the flush-in device 5and can be connected in a similar way via a further manifold device 12with the reservoirs B₁ to B₃ for different treatment liquors forproducing the desired running surface reinforcements of the cylinderbores 1'.

The other flush-in device 11 substantially differs from the firstflush-in device 5 in that the lances 6 of the flush-in device 11 can beelectrically connected as an anode to an electric current source 13, theother pole of which is electrically connected with the cylinder block 1, the latter being connected as the cathode, so as to be able togenerate within the respective treatment liquor in the cylinder bores 1'a flow of electric current.

FIGS. 2 and 3 show an exemplified structure of the manifold devices 10and 12, respectively.

The connections 15 for the feed and return conduits are arranged on theunderside of a housing 14; the different reservoirs V₁ to V₅ and,respectively, B₁ to B₃ are associated with said conduits. Saidconnections 15 can be connected via a movable pipeline 16 with aconnection 17 on the top side of the housing 14, said connection in turnbeing connected with the feed conduit 8 and the drain conduit 9 of oneof the flush-in devices 5 and 11.

So as to be able to adjust the pipeline 16, a rotary dish 19 fitted witha rotary motor drive 18 is arranged within the housing 15 coaxially withthe connection 17, so that the pipeline 16 is swivel-mounted, pivotingaround a tilt axis K, the latter being disposed vertically relative tothe axis of rotation of the rotary dish 19.

When the rotary dish 19 is adjusted by rotation, the pipeline 16 isswivelled from the position shown around a tilt axis K anticlockwise, sothat the ends of the pipeline 16 are removed from the connection 17, aswell as from the connections 15. Subsequently, as soon as the rotarydish 19 has reached a position in which the right (in FIG. 2) end of thepipeline 16 has assumed a position neighboring a desired connection 15,the rotary dish 19 is shut down. The pipeline 16 is then pivotedclockwise until the ends of the pipeline 16 are tightly joined with theconnection 17 and with the desired connection 15. This establishes thedesired connection between one of the connections 15 and with theconnection 17.

So as to be able to connect the feed conduit 8, on the one hand, and thedrain conduit 9, on the other hand, of a flish-in device 5 or 11 with adesired reservoir V₁ to V₅, or B₁ to B₃, two separate rotary dishes 19have to be arranged in each case with separate pipelines 16, which, inthis case, are adjusted simultaneously.

The number of connections 15 with the manifold devices 10 and 12 mayvary if different numbers of reservoirs for pretreatment and coatingbaths are connected to said manifold devices.

According to FIG. 4, the flush-in devices 5 and 11 each have the lances6 in multiple numbers, such numbers conforming to the number of thecylinder bores 1' of the cylinder block 1.

Each of the lances 6 is arranged within a rack 20 on a lance support 21,such support being arranged displaceably in the way of a carriage on theguide rails 22, sliding in the direction of the axis of one of thecylinder bores 1'. The displacement of the lance supports 21 can takeplace, for example pneumatically by means of the pneumatic cylinders 23,the pistons of which each are connected in terms of with the associatedlance support 21 via a yoke 24 and the rods 25.

FIG. 4 shows that the cylinder block 1 has a vertical axis Y. Theflush-in devices 5 and 11 have lances 6. There is means 23 connected tothe flush-in devices for axially inserting the lances 6 at an angle Xoffset from the vertical axis Y into the cylinder bores 1'.

The closing pieces or closing elements 7', 7" are arranged on each lancesupport 21; with said pieces or elements, the cylinder bores 1' can besealed liquid-tight at both face ends after the lances 6 have beeninserted.

In this connection, a first closing element 7' designed as a sealingring is arranged directly on the lance support 21, said elementcooperating with the cylinder head surface of the cylinder block 1facing the lance support 21, and being pressed onto the said cylinderhead surface by the lance support 21 when the lance 6 is inserted in thecylinder bore 1'. The lower end of the respective cylinder bore 1' issealed off in this way. The other closing element 7" has a stop 26,which cooperates with elements of the housing in the crank space of thecylinder block as soon as the respective lance support 21 has beenadvanced sufficiently far against the cylinder block 1. Once the lancesupport 21 has then reached its final position, in which it is advancedagainst the cylinder block 1, the stop 26 is retained by said parts ofthe housing of the cylinder block 1 in a position displaced in thedirection of the lance support 20; in said position, a ring seal 27 isradially clamped against the adjacent zone of the cylindre bore 1', asexplained hereinafter.

A manifold ring as well as a drain tube are arranged axially between theclosing pieces or closing elements 7' and 7"; the bath liquor can beadmitted into the cylinder bore via said manifold and drained therefromvia said tube. For said purpose, the manifold ring and the drain tube 29are connected with the feed conduit 8 and, respectively, the drainconduit 9.

According to FIGS. 6 and 7, the manifold ring 28 has the shape of ashort cylindrical tube piece, the inner wall of which forming at the endpointing upwardly in FIG. 6 a cone widening toward the end, whereby anangle of about 10° is formed between the cone-like wall zone and avirtual circular cylinder surface. On the outer side of the drain tube29, a ring stage 30 is arranged between a lower zone (in FIG. 6) with agreater outside diameter, and an upper zone with a smaller outsidediameter, said ring stage forming a flank of a V-shaped outercircumference groove 31, of which the other flank is arrangedapproximately parallel with the cone-like inner wall part.

The manifold ring 28 is penetrated by the axial ducts 32, which areradially arranged between the inner circumferential wall and the outercircumferential wall of the manifold ring 28, with even distributionacross the circumference. On the inside of the manifold ring 28, withinthe zone of the cone-like inner wall part, said ducts 32 have the firstorifices 33, and on the side of the outer circumference of the manifoldring 28, the additional orifices 34 within the zone of the annulargroove 31, said groove being designed with sufficient depth and beingpenetrated by the ducts 32.

The ducts 32 are connected with the drain conduit 9--see FIG. 1--andserve the purpose of discharging bath liquors to the outside, suchliquors having been admitted into the cylinder bores 1' of the cylinderblock 1, and of permitting a laminar flow in the axial direction alongthe walls of the cylinder bores 1'.

The drain tubes 35 shown by way of example in FIG. 5 serve for admittingthe bath liquors into the cylinder bores. Said tubes have an inside tube36 for feeding the bath liquor, said inside being made, for example ofplastic material, and widening like a funnel at its outlet opening 37.The inside tube 36 is jacketed by a carrier tube 38, which primarilyserves the purpose of assuring the required mechanical strength of thetotal arrangement.

At least with the flush-in device 11 (see FIG. 5), the drain tube 35serves also as an anode. For said purpose, the carrier tube 38 isjacketed by a tubular anode 39 made, for example, lead or the like.Preferably, the outer circumferential surface of the tubular anode 39 isprovided with the parallel circumferential grooves 40, which have asubstantially round cross section, and which are arranged closely nextto each other, in a way such that small bridges are formed between thegrooves 40.

This is shown in FIG. 5E.

Due to such design of the outer side of the anode, relatively high fieldintensities are achieved within the zone of the bridges between thegrooves 40.

On the side of the tubular anode 39 remote from the outlet opening 37, acover sleeve 41 made of electrically insulating plastic material isarranged adjoining said side.

The drain tube 35 is concentrically arranged within the manifold ring28, whereby the outlet opening 37 is disposed close to the closing pieceor closing element 7".

When bath liquor is admitted via the inside tube 36 into a cylinder bore1', and drained from the respective cylinder bore 1' via the ducts 32 ofthe manifold ring 28, a laminar flow is obtained on the walls of thecylinder bores 1', such flow following a course from the ends of thecylinder bores 1' in the crankcase side, to the lower ends (in FIGS. 1and 4) of the cylinder bores 1'.

It is basically possible also to operate with a reversed direction offlow by admitting the respective bath liquor via the ducts 32 of themanifold ring 28 and discharging it via the inside tube 36.

If the drain tube 35 needs not to be designed as an anode, for exampleas in the case of the flush-in device 5, it may be entirely structedfrom plastic parts.

So that the cylinder bores 1' can be sealed off against the crank space,provision can be made for the closing elements 7" shown in FIG. 8.

Said closing elements substantially consist of the two rigid disks 42and 43, which can be axially moved relative to each other.

The lower (in FIG. 8) disk 43 has on its top side a cone-like outermarginal zone 43', whereas the upper disk 42 has an outer marginal zone42' substantially complementing the former. Radially inwardly, the outermarginal zone 42' is adjoined by a ring stage 42".

A substantially funnel-like sealing body 44 is arranged between thedisks 42 and 43, said body consisting, for example of an elastomermaterial. The wall thickness of the sealing body 44 tapers in thedirection of the larger funnel opening. With its smaller funnel opening,the sealing body 44 adjoins the ring stage 42" of the disk 42, whereasthe edge of the larger funnel opening of the sealing body 44 rests onthe radially outer zone of the outer marginal zone 43' of the disk 43.The opening angle of the funnel formed by the sealing body 44 is, in theunstressed condition (cf the left half of FIG. 8), smaller than theopening angle of the cone surfaces 42' and 43'.

When the disks 42 and 43 are adjusted against each other from theaxially spaced position shown in the left part of FIG. 8, into theposition shown in the right part of FIG. 8, in which the disks 42 and 43rest one on top of the other, the edge of the larger funnel opening ofthe sealing body 44 is radially pressed outwardly from between the disks42 and 43, so that a ring-shaped sealing lip is formed, which seals theannular gap between the wall of the cylinder bore 1' and the disks 42and 43.

The disk 43 can be arranged fixed relative to the lance support 21 and,for said purpose, can be mounted on the lance support 21, for example bymeans of rods (not shown). The disk 42, as a stop, may directlycooperate with parts in the crank space of the cylinder block 1, or itmay be fitted with a stop 26 (cf FIG. 1), so that the disk 42, when thelance 6 is inserted in the crank space of the cylinder block 1 by saidparts, is advanced against the disk 43, and the sealing body 44 canbecome active as a seal.

The closing element 7" can be used in a different connection as well,for example for sealing the ends of tubes and the like.

What is claimed is:
 1. Device for producing reinforcing layers oncylinder running surfaces of the cylinder bores for internal combustionengines having a cylinder block having a vertical axis,comprisingflush-in devices for admitting bath liquors into the cylinderbores; said cylinder bores having face ends; a manifold arrangement forconnecting said flush-in devices with a plurality of basins andreservoirs for treatment and coating baths to be successively admittedinto the cylinder bores; said flush-in devices having lances, and meansconnected to said flush-in devices for axially inserting said lances atan angle offset from said vertical axis into the cylinder bores and saidlances are provided with closing pieces by which said cylinder bores areclosed liquid-tight on both their face ends.
 2. Device according toclaim 1, comprisinga pretreatment station in which differentpretreatment baths are admitted one after the other by means of firstflush-in devices; and a coating station in which different coating bathsare admitted by means of second flush-in devices.
 3. Device according toclaim 1,wherein a closing piece with a spreading seal is located on theend of a lance of the flush-in device projecting into the cylinder bore.4. Device according to claim 3, comprising two dish parts, having dishedges,said two dish parts being axially movable relative to each otherand having diameters smaller than the diameter of the cylinder bore;between said two dish parts is a truncated cone shaped elastomer ringhaving a wall thickness increasing toward the one face end having thesmaller diameter; said elastomer ring is radially supported on both faceedges in a way such that it forms a sealing lip projecting annularlybeyond the dish edges as soon as the dish parts are axially clampedagainst each other.
 5. Device according to claim 4,wherein during theinsertion of the flush-in device into the cylinder bore, a dish part oran element connected therewith, cooperates as a stop with parts in acrank space or on a crank bearing tunnel of the cylinder block beforethe flush-in device reaches an axial final position, so that said dishpart is axially pressed against another dish part when the flush-indevice is completely inserted.
 6. Device according to claim 1,comprisinga closed circuit means such that the treatment both or coatingbath each are at least partly passed through the cylinder bores in saidclosed circuit for through-flow treatment or through-flow coating, underexcess pressure.
 7. Device according to claim 1, comprisingmeans forpassing the baths through the cylinder bores with a laminar flow. 8.Device according to claim 1, comprisinga bath inlet means formed on theparts of the flush-in devices insertable in the cylinder bores, or ontheir supports, for obtaining a low flow rate by a large flow crosssection.
 9. Device according to claim 1, comprisinglances insertableinto the cylinder bores; and anodes tubularly enclosing said lances,said anodes having grooves extending all around and being arrangedclosely to each other.
 10. Device according to claim 9, wherein saidgrooves have an approximately semicircular cross section.
 11. Processfor coating cylinder running surfaces of the cylinder bores of aninternal combustion engine having a cylinder block having a verticalaxis, and comprising the steps of:producing a laminar flow of a coatingbath on the cylinder running surfaces by utilizing a devicecomprisingflush-in devices for admitting bath liquors into the cylinderbores; said cylinder bores having face ends; a manifold arrangement forconnecting said flush-in devices with a plurality of basins andreservoirs for treatment and coating baths to be successively admittedinto the cylinder bores; said flush-in devices having lances, and meansconnected to said flush-in devices for axially inserting said lances atan angle offset from said vertical axis into the cylinder bores and saidlances are provided with closing pieces by which said cylinder bores areclosed liquid-tight on both their face ends; maintaining an electricgalvanizing current between an anode in each cylinder bore and thecylinder running surface; and intensifying said current.
 12. Spreadingseal for sealing cylinder bores of an internal combustion engine, incombination with a device for producing reinforcing layers on cylinderrunning surfaces of the cylinder bores for the internal combustionengine having a cylinder block having a vertical axis,comprisingflush-in devices for admitting bath liquors into the cylinderbores; said cylinder bores having face ends; a manifold arrangement forconnecting said flush-in devices with a plurality of basins andreservoirs for treatment and coating baths to be successively admittedinto the cylinder bores; said flush-in devices having lances, and meansconnected to said flush-in devices for axially inserting said lances atan angle offset from said vertical axis into the cylinder bores and saidlances are provided with closing pieces by which said cylinder bores areclosed liquid-tight on both their face ends; and said spreading sealcomprisingtwo dish parts having dish edges; and said two dish partsbeing axially movable relative to each other and having diameterssmaller than the diameter of the bore; between said dish parts atruncated conical elastomer ring having a diameter increasing toward oneface end with the smaller diameter being radially supported with bothface edges in a way such that it forms a sealing lip annularlyprojecting beyond the dish edges as soon as the dish parts axiallyclamped against one another.
 13. Spreading seal according to claim12,wherein the two dish parts have conical marginal surfaces disposedparallel with each other and facing one another, between which theelastomer ring is already clamped when the dish parts are axiallyclamped against each other.